Underreamer.



P LNTEE JULY 3l; 1908.

E, C. WLSGN.

UNDEEREA oATIoN FILED Nov. as, 1905.

MER.

APPL

2`SHEET'S-SEBET l.

f figure ik E Janusz* zkliillllll.

No. 327,595. PATENT@ JULY s1 i906. E. G, www.

' UNDERREMBR.

APPLIGATIAGH FILED EDV. 28. 1905.

2 SEEETS-SEEET 2.

@QW @www fw Y a 1mi-im www pplication ia November 28, 2905. Mariel Z.

.To 'uZL .1i/hom, z may; concern: f

Beit known that i, Emmi C. W'ILSUN, a Gluzen 0i @he United. Stazes, esifiiiig at kisiisii, in the Cmmivy 0i 'imm sind, Stati; @i

Califoms., have invented a new and useful' Undermmer, of which he oiiowiug is is. spscificsitimi.

` Gbjecis 0i' .this invention me to piovidfe :im

mimdrei of eamer body, .and to leave e. mimi# mum open space between the Gutters t@ Te naiv-e iii@ i003@ matezii oi' siudge ai 'the bot tom oi" the Weil or other opening aiming 'the opfamion of dziilng.

By invnticm ii, is possibe to incease the trengiii of iii@ @mss @E T Wiiisii suspands the entiers.

in this inventisn si frogs Garfi formefi of a. Single img-ing is pmviried "of suspending vim uteis.

Admi/ila? decided advantage siiiipicii'wy conv-911mm@ 0i @washing and fieimving the cuttei's and suspending sevices 'fiom iia remmer-body. Another advantfige is iaciiity ci coiiapsiiig; the cu tiers. i SQ Sonstruut the mmitii 0i' h@ undeireamsi as to dispense wih smak be twean the coilapsed utteis, thus enabling ille (intiem` izo dose. togeiiis. mature maximum streiigsh of Gamers.

Tile mcnmpauying dm *iiigsliustmte invention.

Figuie i is a. View 0i the uneirmamer in a. casing .inst before ii has passed aiifogii 'the shoe of theasing, the par #s .iQ-ing cua isd. Fig. 2 is a, View locking a@ the 'betnm Fig. 1. Fig. 3 is a View of this 'newiy-'inveni underrezimei in si well, the Same having just passed 'through the casir1g-shoe and uxpmifi ed for Teaming the infie beow. Portions im?. shown in mid-seciiion- Fig. i is a vi .if 100king at the battelli o" `Fig. Fiv. 5 a. 'vie'.w of theV manier-body 2.1'. ghi. .fmgiias to i? l sind 2, Fig. (j is a. viw'iooiiiiig at the bob tom of Fig. 5. Fig. 7? is :i imm vic-.w ai :i cutter detached. big. 3 is mi miga 936W of a cutter at right ingles m Fig.. 7. Fig. Q is a.

new of tim insi'i Gi oi' the cutter.

i?! View 10Q' 15gg-down on the 'wp of iii@ demciicl. Fig. i bottom view ci ign A riolifiw indy 0i im iniciar?" m m im.. immer mlmmiimig iii piong i?, mining if. f n. J 1i ff i and piongs 21m/mg suouiflei@ .ai f. .a

nel mms izo mim ways 3 zum ugs me. pfofifid. with termiimte Wadiy-piojeating 2 i@ Spiemi 'apart nui-as the Cutters, which ae inta shaiigw; the uitepsimnk; 42, bemiiig-smuiai'bi m' ih@ cutteis to engage insiff tile Ways 4, expansion bearing-faces o' *die Qute@ mi. the. sids of said cuttm's.

inns? fn ses of til@ prongs @are paiifiimi, ami the sides. oi siimiidis 2', whisk. ifoim the 5:5, am fsc pzifiiii. Til@ cuite. bank if and its ig-siioiies 4.2 ai@ Hiring' i 'div/ is to 99:53 the sida; 0i edges Liireoi me mui it he ways p ai @imams spying-mism' .ins 'fo I rags w exjgimci tim same.

J '15a ai Mimi( farming a. seat the spring; @ne of nimm dowawpins 8 jimmy" im provided means im' iioiding th@ bimk or spingeat Y in pi aizsigimcs @im spfeidiiig beai'iiig; im il idling the miti@ mi., ami l() ille dois/nw 'iin-mt bearings mi' me, cahiers. miie iwn iunst bem.; 1U wie in the nzibum 'of simili d luci by 'the @dyes of 'bhs oiis at time :'Z/ ai@ @i substimt (mi, elle@ i The pump@ of Eibody 5f one tiicimesfs tiii'ough t anew are raduc. ai; they? iugQ for spraading the cut i h loue 0i iii@ forks Til@ @cmi-Y lil lIO

The expansion bearingtaces 43 terminatev at their upper ends' in rounded corners or bearings lo to ride more readily over the beveled end faces 17 of the downwardly-projectinglugs 2 to engage said hearings for ex` panding the cutters.

its designates recesses iu the inner faces of the cutters for engaging the ends of the cross 5.

19 and 20 indicate the usua'l tension-nut for the spring 6 and the critter-pin for securing the same.

To assemble the underreainer, the block 7 will first be placed n the stem 5 of the cross 5, and the spring 6 is then adjusted and secured in place by the n ut l!) and cotterpin 2th Then the cutters are placed on the ends,respectively, of the cross which seat in the recesses 1H therefor. Then the )arts thus assembled are inserted into the hollow .mandrel and brought into the position shown in Fig. 3, whereupon the'dowelpins` 8 are inserted and the cross-piece formed of the bolt li is then inserted. T he nut 12 is placed in its angular socketi, and the bolt or cross-piece v1l is then screwed home. The underreamer is then in condition for operation.

To use the underreamer, the cutters will be drawn down below the downwardly-projecting lugs 2, thus collapsing the same into the position shown in Fig. l., whereupon the underreamer will be inserted into the pipe or casing in the usual manner and allowed to descendf When it has passed through the shoe, as shown in Fig.` 3, the spring operates in the usual manner to draw the cross 5 up, thus bringing the cutters into the expanded position shown in Fig. 3. The rounded shoulders 16 ride faces 1.7, and the u )per ends olE the cutter stems seat against t e downthrust bearings 10, and the bearing-shoulders 4 of the cutters engage the ways 3 ot', the fork prongs or members 2, thereby being solidly held during the operation ol" underreaming. The s )reading bearings 9 of the lugs 2 engage t e'ex pausion bearing-faces 43 of the cutters at the same time, so that the toolis practically a unit during the operation of underreami'ng.

designates the usual shoulders on the cutters for drawing the same in when the tool is removed through the pipe or casing 40. .it is advisable that the lower ends of the forks 2 should not form downthrust bearings for the cutters, as there would otherbe a tendency gif-crystallization of said forks, which is avoided by making the downthrust bearings at 10 only. f

The cross-piece 1l serves as a brace for theI prongs oi the fork and prevents accidental removal ofthe cutters and T or cross 5.

lt is to be noted that by the construction shown the cutters are quickly expanded at the initial upward movement of the same readily over the beveled after escaping the shoe of the casing 40, and that immediately thereafter the cutters are solidly held in the straight and parallel ways 3, and that when the'cutters are fully drawn up they seat on the downthrust bearings 10 and the spreading bearings 9, while theV shanks Aare rigidly held throughout their length. Said'spreading bearings are on the lugs 2, which constitute wedges for wedging the cutters a art, and said bearings are at the sides of the ower ends of the body, thus engaging the outer edges of the cutters-t0 hold the cutters apart and leaving an open space between the middle portions of the cutters for a greater distance upward from the lower ends of the cutters than would be the-case were the cutters held a art byany intermediate portion between t e lugs.

i term the cutters for the reason that the rounded corners 16, which extend away from the shank at right angles thereto, are in the nature of shoulders, the inner faces 4 of which enga ing faces 9 of the side lugs 2 to ters and hold them apart.

What l claim is` i 1. An underreaIner-body. terminating in prongs having projecting lugsat their lower ends with spreading bearings -9 "for holding the cutters apart. i

race the out- 2. An underreaIner-bodyl terminating prongs and provided with upper and lower bearings for the cutters, said prongs having projecting lugs, the edges of which form lower bearingsfor holding the cuttersapart,"

and theends of said lugs having beveled end faces.

An underreamer-body terminating' in prongs the inner faces of which are provided with straight parallel ways, the ends of said prongs terminating in lugs below said ways to spread and holdthe cutters apart.

4. -An unilerreamer-body terminating in shouldered cutters,

e the -spreadprongs forming a fork, said prongs havingI i shoulders on their inner faces to form ways for the cutters.

IIO

5. A hollow un'derrearner-bodyiterminating in prongs forming a fork having shoulders on the inner faces to form ways Jfor the cutters, cutters' in said ways, 'a cross in said hollowL body for o erating said cutters, a spring lfor operating t e cross, a block in the body to form a seat for said spring, and one or more dowel-pins securing the block in place. 6. A hollow underreamer-body, cutters, a cross insidethe hollow body for operating said cutters, a spring for operating said cross, a block in said body forming a seat for said spring, and one 'or more dowel-pins for .holding the block in place, said block and ins be ing located entirely above thehea of the cross. 7. A hollow underreamer-body terminating in prongs forming a fork and provided with ways and downthrust bearingsfor cutters, cutters in said ways engaging said bearings, a cross for operating said cutters, a spring for actuating said cross, a block forming a guide .for the stem of the cross and a seat for the cross-actuating spring, its lower end terminating above the head ofthe cross and projecting below the downthrust bearings to hold the upper ends of the cutters apart, and means for holding the block in the to rest on afterthey have expanded to a norreamer-body.

8. A hollow underramer-body terminating in prongs forming a fork, said prongs having shoulders on their inner faces to form ways, cutters in said ways, means for operating the cutters, and a detachable cross-piece connecting the ends of the fork.

9. A11 underreamerbody terminating in prongs forming a fork and provided with shoulders on the inner faces of the -prongs which form rcutter-ways and terminate in downwardly-projecting lugs, and cutters mountedbetween the prongs of said fork and having shoulders inside tl fork and faces to bear on the projecting lugs.

10. in underreamer-body terminating in prongs having projecting lugs at their lower ends to hold the cutters apart.

11. An underreamer-body terminating in prongs forming a fork having beveled faces at the 'ends of its prongs, cutters having shoulders to ride over said beveled faces, and means for suspending said cutters in said body.

12. An underreamer-body terminating in prongs forming a fork, the ends of said prongs being provided with lugs to spread the cutters apart.

13. A n underreamerbody terminating in prongs forming a fork, said prongs having shoulders on the inner faces to form ways for the cutters, and said prongs terminating in lugs to act as spreaders for the cutters.

14. A hollovsr underreamer-body terminating in prongs forming a fork, said prongs terminating in lugs for spreading the cutters, said lugs having beveled ends to engage bearings on cutters to expand cutters. l

15. An underreamer-body terminating in prongs forming a fork, said prongs termi nating in lugs or projections, said lugs having beveled faces or bearings to expand .the cutters, and also faces or bearings for the cutters mal position for reaming.,

16.l An underreamer-cutter having two shoulders and a bearing-face on the inner side of each of the two shoulders of the cutter.

17. An underreamer-cutter having a shank and a shoulder on either side of the shank of the cutter, each of said shoulders projecting at right angles to the shajnk of the cutter and having a bearing-faceon its inner side.

18. A11 underreamer having a body terminating in a fork, and cutters suspended between the prongs of the fork, the ends of said prongs constituting wedges tciwedge between the cutters.

19. An underreamer comprising a body terminating in two prongs, and cutters each having two shoulders anda bearing-face on theinner side of each of the two shoulders to engage said prongs.

20. An underreamer comprising a body terminating in prongs the inner faces of which are provided with straight parallel ways, and cutters having straight Shanks fitting said ways, the ends of said prongs terminating in lugs below said ways to spread and hold the cutters apart.

In testimony whereof I have hereunto set my hand'at Bakersfield, California, this 20th day of November, 1905. j

ELIHU C. WILSON.

In presence of- H. I. TUPMAN, T. E. KLOPSTEIN. 

